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TitleNew insights into Keewatin glacial landsystems
AuthorMcMartin, IORCID logo
SourceGAC®-MAC 2021, London, Canada: Exploring Geosciences Through Time and Space/GAC®-MAC 2021, London, Canada : Explorer les géosciences à travers le temps et l'espace; Geological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 44, 2021 p. 213 Open Access logo Open Access
LinksOnline - En ligne (complete volume - volume complet, PDF, 2.45 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20200633
PublisherGeological Association of Canada
MeetingGAC-MAC London 2021; London, ON; CA; November 1-5, 2021
Mediaon-line; digital
File formatpdf
NTS46D; 46E; 56A; 56B; 56C; 56F; 56G; 56H
Lat/Long WENS -93.0000 -87.0000 66.0000 64.0000
Subjectssurficial geology/geomorphology; geophysics; Science and Technology; Nature and Environment; glacial history; Wisconsinian glacial stage; glaciation; ice sheets; ice flow; deglaciation; sediment transport; sediment dispersal; remote sensing; satellite imagery; isostasy; modelling; glacial landforms; eskers; lineations; sea level changes; clasts; provenance; mapping techniques; Laurentide Ice Sheet; Keewatin Sector; Keewatin Dome; Keewatin Ice Divide; Dubawnt Dispersal Train; Dubawnt Lake Ice Stream; ArcticDEM; ice streams; ice stream margins; Digital elevation data; Phanerozoic; Cenozoic; Quaternary
ProgramGEM2: Geo-mapping for Energy and Minerals Rae Province, Synthesis of glacial history
Released2021 11 01
AbstractIn the former glaciated areas of central mainland Nunavut west of Hudson Bay, large volumes of ground-based datasets and high-resolution remote sensing imagery were recently integrated to allow interpretation of glacial landsystems. This central part of the Laurentide Ice Sheet (LIS) holds the key to accurate paleo-ice sheet reconstructions due to its sheer size, presence of the Keewatin Dome and its effects on modelling glacio-isostatic adjustments (GIA), and diversity of glacial landform assemblages and patterns. From the early field observations of Tyrrell suggesting a 'Keewatin Glacier' to the remote compilations of cross-cutting glacial lineations, and the recognition of important glacial landmark features such as the Keewatin Ice Divide, the Dubawnt dispersal train and the Dubawnt Lake Ice Stream, the recent history of this region has always fascinated glacial geologists and generated important discussions. Debates on the stability of the Wisconsinan ice cover in Hudson Bay, the location of ice divides and saddles radiating from a central dome, the timing of the giant radial esker system and the style of deglaciation still continue today. Recently, increased field-based research on glacial dynamics, relative sea level variations and chronology, and glacial sediment provenance, have contributed to refining the configuration and paleoglaciological evolution of the Keewatin Sector of the LIS. The advent of high-resolution digital elevation models such as ArcticDEM (2 m) and the development of innovative techniques for dating glaciated terrains provide a timely opportunity to synthesize previous work, produce new maps of glacigenic features and interpretations of glacial landsystems, and identify gaps in knowledge and outstanding issues. This presentation will briefly review the development of mapping approaches and concepts in Keewatin, and summarize the latest identification of various glacial landsystems, including ice streams, palimpsest streamlined landscapes, and terrains where basal ice thermal regimes fluctuated between cold-based and warm-based, in an effort to provide constraints on the glacial history of Keewatin and numerical modelling of the LIS.
Summary(Plain Language Summary, not published)
This invited keynote presentation at a National conference will discuss the results of new glacial landscape mapping in the Kivalliq region (Keewatin) in Nunavut synthesizing large volumes of ground-based and high-resolution remote datasets as part of the GEM-2 Rae Synthesis of Glacial History and Dynamics Activity. The talk will review previous work, summarize the latest research, and identify gaps in knowledge and outstanding issues. This research was undertaken to provide new geological knowledge on the glacial history of the Kivalliq region and to help understand glacial transport across various glacial landscapes of northern Canada. The findings will support informed decision making for resource exploration and land use management.

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